JPS6177810A - Optical connector plug - Google Patents

Abstract

PURPOSE:To permit easy assembly with the smaller number of the easily formable parts to be used by constituting an optical connector plug of 5 parts; a ferrule, plug holder, connecting nut, spring and detaining member. CONSTITUTION:The ferrule 23 is inserted via a spring 26 into a plug holder 24. The 2nd recessed groove 29 of the plug holder and the 1st recessed groove 27 of the ferrule mate with each other in the stage of compressing the spring to the prescribed degree. The ferrule and plug holder are so held that the bases of the respective grooves are made flush. The ferrule 23 is held to the plug holder 24 when a U-shaped detaining member 29 is inserted into the 2nd recessed groove 28 from the outside circumference of the plug holder. A connecting nut 25 is provided to the outside circumference of the plug holder 24 from the small-diameter cylindrical part 242 side of the holder 24. The groove 27 has the width at which the end of an optical fiber 22 is brought into elastic contact with the other optical connector plug or optical system when the optical connector plug is mounted to an adapter or receptor. The connection is executed simply by inserting the detaining part 29 into the 1st recessed groove of a leg 232 when said groove is viewed through the aperture at the base of the groove 28 prior to the insertion of the member 29.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an optical connector plug, and more particularly to an easy-to-manufacture optical connector plug in which a ferrule and a plug holder can be easily locked in a predetermined state. .

[Technical background of the invention and its problems]

Conventionally, the FA type optical connector, which has been widely used, has a structure as shown in FIGS. 3 and 4.

That is, the optical fiber (2) is held by a ferrule (3), a plug holder (4) is provided on the outer periphery of this ferrule (3), and a connecting nut (5) is provided on the outer periphery of this plug holder (4). , constitutes an optical connector plug (1).

For this optical connector plug (1), insert the head of the ferrule (3) into the adapter or receptacle, and then tighten the connection nut (5).
) so that it can be coupled to an optical fiber or a circuit having an optical system. In this case, the 7 erule (3), which normally protrudes due to the repulsive force of the spring (6), is locked by the connecting nut (5).
It is pushed back in the direction of contraction of the spring (6) and comes into elastic contact with other optical connector plugs and optical systems, thereby transmitting and receiving optical signals with little loss. That is, ferrule (3) is this ferrule (
3) and 1 except for the spring (6) are movable only in the axial direction with respect to the optical connector plug.

This range of movement is from the contact between the 7 flange (7) of the ferrule (3) and the inward 7 lang of the plug holder (4) (8) to the 7 flange (7) of the 7 ferrule (3) and the bushing (9). )
until the end face a10 comes into contact with the end face a10.

In addition, the rotation of the 7 erle (2) is caused by the concave groove I provided on the outer periphery of the 7 flange (7) of the 7 erle (3) and the bushing (
It is held down by the protrusions (13) provided at the top of the parts (9) combined with each other.

That is, the movement of the ferrule (3) is caused by the 7 ferrule (3) being sandwiched between the plug holder (4) and the bushing (9), and the 7 flange (force recess (II) and the bushing (9) of the 7 ferrule (3)). ) is determined by the combination with the protrusion @.

However, in the optical connector plug (1) having such a structure, when assembling the 7 langes of the ferrule (3) (the force recess qυ and the protrusion of the bushing (9)), the repulsive force of the spring (6) The plug holder (4) must be screwed to the bushing (9) with the parts u2 set so that they match.

This work is complicated and time-consuming), and if you are not skilled, there is a risk of damaging the protruding part of the bushing (9).Also, the bushing (9) and plug holder (4) are screwed together, so it is reliable. There is a problem in that it must be bonded with adhesive to improve its properties.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide an optical connector plug that can use easy-to-manufacture parts without increasing the number of parts and is easy to assemble. There is.

[Summary of the invention]

That is, the present invention provides a ferrule that holds an optical fiber on its axis, which has a large-diameter guide section between the head and the leg, and a ferrule that is provided on the outer periphery of the seven erules between the large-diameter cylindrical section and the small-diameter cylindrical section. A plug holder having a thick stepped portion, a connecting nut provided on the outer periphery of the plug holder, a spring provided between the large diameter guide portion and the thick stepped portion, and a bottom surface formed on both sides of the leg portion. are formed in a pair of parallel first grooves and a thick stepped portion at a position corresponding to the first groove with the spring compressed by a predetermined amount, and are flush with the bottom surface of the first groove. It is characterized by comprising at least an annular second groove portion provided with an opening and a U-shaped locking portion that is locked to the first groove portion via the second groove portion. This is an optical connector plug.

[Example of rising current according to the invention] Next, an embodiment of the optical connector plug of the invention will be described with reference to FIGS. 1 and 2.

The optical connector plug -υ can be roughly divided into 7 erres (to), plug holder 12, 0, and connection nut G! 9. Consists of five parts: spring (to) and locking member (to). 7 Eluru Ken holds the optical fiber 124 on the axis, and is composed of a head (23θ), a leg (23J), and a large diameter guide part (23s), and a bottom (271) on the leg (Z3t). A pair of first concave grooves 127) are formed in which the grooves are parallel to each other.

The plug holder 1241 is composed of a large cylindrical part (241), a thick step part (243), and a small diameter cylindrical part (24J). It has a pair of bottom surfaces (28s) that are flush with the bottom surface (27υ) of the groove portion 127). That is, the bottom surface (28+
) has an opening formed in the center. The 7 erle (c) is inserted into the plug holder (to) via the spring (to), and with the spring compressed by a predetermined amount, the second recess ILLS (to) of the plug holder and the first recess of the 7 erle are inserted. The two grooves are held so that the forces match and the bottom surfaces of the respective grooves are on the same plane, and the U-shaped locking member (C) is moved from the outer periphery of the plug holder to the second groove (Mihe). By inserting the plug into the plug holder, the plug is held in the plug holder. The connecting nut pad is provided on the outer periphery of the sieve lug holder (to) from the small diameter cylindrical portion (24t) side of the plug holder (to).

The width of this first concave groove is determined by the width of the ferrule I. When the optical connector plug is attached to the adapter or receptor, the optical The width of the notch of the locking part is set to have some margin with respect to the width between the bottom surfaces (27+) of the first groove part (5), and the ferrule (231m in the axial direction) is It is designed to allow smooth movement.

According to the above-mentioned structure, before inserting the end of the locking member, the locking portion (to) is inserted when the first groove of the leg (23t) is visible from the opening in the bottom of the end of the second groove. Since all you have to do is insert it, the work process is extremely simple compared to the conventional structure in which the protrusion of the bushing is assembled into the concave part of the ferrule's flang, which is hidden from view by the connecting nut or plug holder. If you insert the component ω, the outer periphery of this engaging member 1 will be connected. (Since the inner periphery of 251 is a stopper, it will not fall off when removed, and you can use adhesive as before.) This eliminates the need for adhesives and any undesirable accidents caused by adhesives.

In the real MM series described above, the ferrule (c) is the head (23θ).

Although the leg portions (23,) and the large-diameter guide portion (233) are formed integrally, they may be constructed from separate parts, and it goes without saying that they can also be applied as they are to optical fiber plugs of other structures. be.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to provide an optical connector plug that has a small number of parts, can be assembled in a short time, and can be expected to have low loss.

[Brief explanation of drawings]

1 and 2 are views showing one embodiment of the optical connector plug of the present invention, FIG. 1 is a sectional view taken along the axis, and FIG. 2 is a cross-sectional view of FIG. 3rd cross-sectional view
3 and 4 are views showing an example of a conventional optical connector plug, FIG. 3 is a sectional view taken along the axis, and FIG. 4 is a view taken by cutting FIG. 3 along the line B-B. It is illustrated with a cross-sectional diagram. 21... Optical connector plug 22... Optical fiber 23
...7 Elle 24...Plug halter-25
- Connection nut 26 - Spring 27 - First groove 28 - Second groove 29 - Locking part

Claims (1)

[Claims] A ferrule that holds an optical fiber on its axis and has a large-diameter guide portion between a head and a leg, and a thick-walled stepped portion provided on the outer periphery of the ferrule between a large-diameter cylindrical portion and a small-diameter cylindrical portion. a plug holder, a connection nut provided on the outer periphery of the plug holder, a spring provided between the large-diameter guide portion and the thick step portion, and a pair of legs formed on both sides of the leg portions with parallel bottom surfaces. and an opening formed in the thick stepped portion at a position corresponding to the first groove with the spring compressed by a predetermined amount and flush with the bottom surface of the first groove. and a U-shaped locking portion that is locked to the first groove through the second groove. Optical connector plug.